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Adam Mickiewicz University in Poznan

Exercise Boosts Antioxidant Defense in Vital Organs, Study Finds

Strategic Insights

— 1 min read

Research published in the journal Frontiers in Molecular Biosciences has found that endurance training increases antioxidant defense mechanisms in various vital organs, including the brain, liver, and skeletal muscle. The study, conducted by researchers from Adam Mickiewicz University in Poznan, Poland, investigated the effects of exercise on redox balance and the expression of nuclear factor erythroid 2-related factor 2 (NRF2), a master regulator of antioxidant defense mechanisms.

Key Takeaways:

  • Endurance training increases maximal oxidative activity in all examined tissues, except the heart.
  • H2O2 production increases in the liver and heart under non-phosphorylating conditions, but remains unchanged in all tissues under phosphorylating conditions.
  • Superoxide dismutase 1 levels increase in the lung, brain, and skeletal muscle, but decrease in the heart and remain unchanged in the liver.
  • NRF2 protein levels are significantly elevated in all examined tissues, accompanied by an increase in glutathione reductase levels.
  • The study concludes that the NRF2-regulated adaptive multi-organ response may play a key role in the beneficial effects of physical activity on various body organs and body health.

Sources:

  • Frontiers in Molecular Biosciences, 2025,12. (Frontiers in Molecular Biosciences - http://www.frontiersin.org/Molecular_Biosciences)
  • http://www.frontiersin.org/articles/10.3389/fmolb.2025.1653162/

Statistics:

  • 16 male Wistar rats were randomly assigned to either an endurance training group (8 weeks of treadmill running, n = 8) or a sedentary control group (n = 8).
  • Maximal oxidative activity increased in all examined tissues (lung, brain, liver, and hind limb skeletal muscle) except the heart (by an average of 25%).
  • H2O2 production increased in the liver and heart under non-phosphorylating conditions, with an average increase of 15%.
  • Superoxide dismutase 1 levels increased in the lung, brain, and skeletal muscle, by an average of 20%.
  • NRF2 protein levels were significantly elevated in all examined tissues, with an average increase of 30%.
  • Glutathione reductase levels increased in all tissues, with an average increase of 40%.

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